Receiving apparatus



June l0, 1930. R. DEAsoN RECEIVING APPARATUS Filed Nov. 23. 1928 2Sheets-Sheet 1 June l0, 1930. f R. DEAsoN 1,763,459

RECEIVING APPARATUS Filed Nov. 23. 1928 2 Sheets-Sheet 2 M5. W ,0 i 9mtm @f5 L l .4 ma a 6 Patented June 10, '1930 PATENT OFFICE BOY DEASON, FSMALL HEATH', ENGLAND RECEIVING APPARATUS Application tied. November 23,1928, Serial No. 321,429, and in Great Britain November 29, 1927.

The invention relates to apparatus for receiving, transmittin andamplifying high frequency and low requency electrical currents,particularly for radio purposes, and to the provision of condensersemployed there-r in, and the object of the inventionA is an inexpensiveproduction of apparatus with eater etliclency. f

The kind of apparatus to which the inven-r tion solely relates is onewhereinthere is a casing-likebody containing, enclosing and supportingthe whole of the normally fitted electrical equipment of the apparatusand freely opened by a simple lid which is removed or inspection,replacement, adjustment, etcetera of said equipment without in any wayimpairing its support or efficiency, so that while the hd is removedopening the body the apparatus is still complete and efficient. v t

In this kind of apparatus the feature of the invention is the use toform a permanent part of the body of a rigidly built metal plate-likestructure providing walls which constitute in themselves one element ofcertain condensers employed in the apparatus at earth or otherpredetermined potential. Said metal struc ture is of substantially largearea and may form either the actual casing-like body yof the 3 apparatusor may be enclosed by an insulating casing-like body, but whatever formthe late-like structure takes in the apparatus it 1s always part of thebod as distinct from the lid, and provides ywa l-like surfaces ofsubstantial area capable of forming one element of a condenser or of twoor more condensers having one of their sides at the same electricalpotential. n 1 4 Forboth manufacture and use it is desiraI D ble toproduce an apparatus ofk small dimensions, andto rutilize the spacetherein to the best advantage .for the electrical equipment, and theinvention enables this to be done with very great eciency for the reasonthat large 5 area condensers can be built up upon, and as parts of, theplate-like structure according to the invention without materiallyminimizing the ordinary base or foundation space for the application ofother instruments used in the 5 apparatus.

In one form of the invention in which the metal plate-like structureconstitutes the external casing-like body of the apparatus, saidstructure is of sheet metal and is connected up to earth or othercircuit, and the one, two or more condensers whose one sides are atearth or the same potential are built up upon said structure so thatsaid structure forms one element of all said condensers, and as saidstructure is always at the same potential throughout its entire surfacethere is no possibility of ohrnic resistance being set upbetween thedifferent condensers of which it forms part.

In another form of the invention the metal plate-like structure is aninternal one enclosed by an insulating outer cover or casing like body,but it constitutes one element of two or more condensers having one oftheir sidesat the same electrical potential, as for instance, earth,potential.

The first form of the invention is provided with an insulating basebuilt into the structure forming the exterior casing-like body of theapparatus, and upon this base are mounted the necessary and well-knownaccessories to be employed in the apparatus in conjunction with thecondenser or condensers provided in accordance with the invention aspreviously described, While in the second form of the invention themetal structure is built up upon an insulating part constituting thebase to the insulating outer cover, or casing-like body.

The invention aforesaid is applicable in radio apparatus forv receivingor transmitting or for amplifying or for any of these purposesincombination, the essential features of it being as before stated thatsaid metal plate-like structure forms one element of a condenser or oftwo or more condensers having one of their sides at the same electricalpotential.

The drawings forming part hereof show two forms of the invention, Figs.1-3 where the metal plate-like structure constitutes the externalcontainer or casing-like body of the apparatus, and Figs. 4 and 5 wherethe structure is enclosed by an insulating outer cover or casing-likebody.

Fig. 1 is a iront elevation.

Fig. 2 is a vertical section of Fig. l.

Fig. 3 is a transverse vertical section of Figs. l and 2.

Fig. 4 is a vertical section somewhat similar to Fig. 2.

Fig. 5 is a transverse vertical section similar to Fig. 3.

lVith reference to Figs. l-B, the large area sheet metal structureconstitutes the external container or casing-like body of the apparatusand is comprised by the integral front a, top c, sides Z and c, andlower skirting by which latter the apparatus rests upon any supportingsurface. The open back of this structure is closed by a detachable lid gtitting tightly all round a push-in frictiontight fit. The removal ofthis simple lid freely opens the body and gives free access to theinternal electrical equipment.

iigidly built into the skirting of this structure is a horizontalnon-conductive base Zt, preferably wood, to constitute a foundation forthe valves etc., of the apparatus requiring insulation from thecontainer, certain parts only, such as the valve sockets z' and thetuning coil y', being indicated as attached to this base.

The metal structure is connected to earth and forms one element ofcondensers Z and m having one of their sides at the same electricalpotential, said sides being actually formed by the structure which alsoforms a means for building up the condensers.

rlhe condenser Z is an aerial tuning variable one constituted by thefront a of the structure, by the dielectric Z2, and by the plate-likeadjustable side Z3, which is hinged at Z* to an insulator secured to thecasing front and is moved for adjustment by the spring Z5 in onedirection and by the adjusting screw ZG in the other direction, saidscrew being adapted for hand operation from the exterior of the front aand being insulated from the side Z3 at Z7 where the screw box for saidscrew is connected to said side.

The double condenser m is applied to the top c of the casing orstructure and comprises a fixed condenser formed by said top, thedielectric m2 and the fixed metal side m3, while the variable condenserbuilt against this side m3 is provided by the dielectric m4, and theadjustable side m5 which is similarly moved by a spring me and ahandoperated screw pin m7. The one side of this lixed condenser is theplate-like metal structure itself but both sides of the variablecondenser are plates separate of the structure ot' a diii'erentpotential to the potential of the structure so that this secondcondenser is built up on the top of the other condenser using thestructure only as a support for it, both of its sides being of adifferent potential to the structure.

It will be clear from Figs. 2 and 3 how the plate-like metal structure,constituting the external container of the apparatus, forms a mountingfor these condensers and enables same to be inexpensively built up tolarge area without limiting the space within the apparatus for thedisposition ot the other necessary accessories employed in a radioreceiving apparatus, while at the same time as its entire surface isalways at the same potential there is no possibility of ohmic resistancebeing set up between the diiierent condensers of which said structureforms one element.

The form ot' the invent-ion Figs. 4 and 5 diers only from the previousform inasmuch as the metal plate-like structure is enclosed by aninsulating outer cover ot wood or the like. rlhe outer cover comprisesfront n, removable back a2, top a, sides n, n, base a and elevating feeta7 and as, while the parts of the plate-like structure comprise theintegral front a, top c and sides Z and e, the front and the sidesresting upon the base n of the insulating outer cover. The condenser Zis substantially as aforesaid as also is the condenser m, but in thistorm of the invention two additional condensers r and s of the fixedtype are applied to one of the side walls of the plate-like metalstructure, these condensers being of any suitable form utilizing theplatelike metal structure as one of their elements.

It will be clear with reference to the construction Figs. l-3 that theconductive casing-like body in addition to forming one side ot the oneor more condensers can also serve as an effective electrical conductorfor all instrument circuits in the apparatus which are at the sameelectrical potential as the casing-like body.

Having now described my invention, what l claim and desire to secure byLetters Patent isl. Apparatus for receiving, transmitting or amplifyinghigh frequency and low frequency electrical currents, comprising a metalcasing, a metal plate supported adjacent the inner face of one wall ofsaid casing but insulated from the latter, said wall and said plateforming two elements of a condenser, means tending to move said plateaway from said wall, and means operative from the exterior ot' saidcasing for moving said plate toward said wall in opposition to thelastnamed means.

2. Apparatus for receiving, transmitting or amplifying high frequencyand low frequency electrical currents, comprising a metal casing, ametal plate mounted adjacent to but insulated from the inner face of awall of said casing, said casing wall and said plate forming elements ofa condenser', means tending to move said plate away from said wall, andmeans for moving said plate toward said wall, the last-named meanscomprising a rotatable knob mount-ed externally of said casing and astem carried by said knob and extending through said wall and havingscrew-threaded engagement with said plate, said stem bein insulated fromone of said condenser mem rs.

3. Apparatus for receiving, transmitting or amplifying high frequencyand low frequency electrical currents, comprising a metallic casing, asheet of insulating material mounted on the inner face of one wall ofsaid casing, a metal plate hinged adjacent one of its edges to saidsheet, said casing wall, sheet and plate forming elements of acondenser, a nut carried by said plate but insulated therefrom, and arotatable spindle extending through said wall and sheet and engagingsaid nut for rocking said plate toward said sheet.

4. An apparatus according to claim 3 including means tending to rock theplate away from the sheet.

ROY DEASON.

